Just composed a couple of paragraphs of how to measure the temperature,
then realised that wasn't what you were really asking. Memo to self -
don't forget exam technique!
In my lab days, a simple variac transformer or a mark-space timer, both
with a rotary knob to control temperature, was invariably used to
control the temperature of those flask heater thingies. You'd have to
calibrate them, probably using a hand-held IR gun, or a K-type
I could loan you a CAL 3200 and 12" N type metal sheathed
thermocouple if that is of any use. You would have to add a suitable SSR
or relay for the load as it is only rated at 2A on the internal relay.
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